There is a mixture of opinions on the forum, I have found everyday room temperatures to be fine with my garter snakes.

I use the logic that they thrive as far north as Alaska and as far south as Mexico, so they can handle a wide range of temperatures just fine.

We have so many snakes I lost count, and none of them have special heaters.

I can't imagine winters get very cold in Arkansas, so the heater may be too warm.